Improvement in emery wheels



WILLIAM T.VOSE.

Improvement in Emery-Wheel.

No. 126,597, I Patented May 7,1872.

Mil 1% PATENT OFFICE.

WILLIAM T. VOSE, OF NEWTONVILLE, MASSACHUSETTS.

IMPROVEMENT IN EMERY WHEELS.

Specification forming part of Letters Patent No. 126,597, dated May 7,1872.

To all whom it may concern:

Be it known that I, WILLIAM T. Vosn, of Newtonville, in the county ofSuffolk and State of Massachusetts, have invented an Improved MetallicCenter for Emery Wheels; and I do hereby declare the following to be afull and exact description of the same, reference being had to theaccompanying drawing forming part of this specification, in which Figure1 denotes a side View of an emery wheel having its box or bearingapplied there to in accordance with my invention; Fig. 2, a longitudinaland vertical section takenthrough one series of the holding-ribs, to behereinafter described. Fig. 3 is aside view of the box after being castin the wheel, as it appears detached therefrom.

Similar letters of reference in the accompanying drawing denote the sameparts.

In the application ofmetallic centers to stone wheels two objects mustalways be effectedviz.: first, the center must be fixed in the eye ofthe wheel so that it will not work endwise; and, secondly, it must alsobe so fixed that it will not turn in the eye. In small wheels, such asemery wheels, if the center be cast with a rib upon its peripheryfitting into a groove running around the eye, the thin edges of stone oneach side of the metal rib will soon chip oil and destroy or injure thesetting of the centerpiece and if the center-piece be made square orwith ribs running across the stone, the latter is apt to crack at thecorners of the eye and fly into pieces.

The object of my invention is to set the metallic center securely in theeye in such a manner that the stone will not chip ofl' at the edges ofthe eye nor be liable to crack from the corners of the eye. To this endthe invention consists in chipping out angular recesses in the eye oneach side of the stone, cutting from the edge to or past the middle andarranging the recesses so that those on one side alternate with those onthe other, and then casting in the soft-metal center, the form andarrangement of the notches, when filled with the metal, preventing theWheel from turning on the center and preventing the center from workingendwise, while, at the same time, preventing the stone from chipping orcracking.

In the drawing, A is the emery wheel, and B is the soft-metal center orhearing cast into the eye of the wheel. The eye is made round, so as toavoid sharp angles, which, in practice, cause the cracking of the wheel,as above described. If the metal be cast into a round eye, the adhesionof the metal and stone will not be sufficient to prevent them fromturning independently of each other nor to prevent the hearing fromworking endwise. If notches be out in the eye across the stone, theywill not prevent the bearing from working endwise, and if they areangular notches the stone will crack from them. If a groove be cast inthe eye around the axis of the stone and then be filled in with metal,this will not prevent the stone from turning on the metal, though itwill, for a while, prevent the bearing from working out, but the edgesof the stone on each side of the groove will chip oil, as I have abovedescribed. Hence neither the groove around the eye nor the eye madesquare or recessed across the wheel will accomplish both purposes atonce. I therefore extend my recesses only part way across the Wheel, soas to get the full strength of the latter on the opposite sides, andthus prevent cracking from that point. To the same end, I cut the recessfrom the edge into the stone, deepening the cut as it extends inward.The stone on the outside is continuous, showing only a circular eye, therecesses being inside of the eye. Thus I get the whole strength of thestone on both sides and prevent the tendency to crack. Cutting from theedge into the stone, as described, a thin edge of stone is left over therecess, but there is no tendency in this to chip ofl', first, because itis so narrow that it is effectually supported from both sides, and,secondly, because it has to resist very little lateral strain, thelatter being nearly all taken up against the butt ends of the recessesformed on the other side of the wheel. When the wheel is pressed to oneside it is held by the enlarged butt ends of the metal ribs on thatside, and when pressed to the other side it is held by the butt ends ofmetal on the latter side. The inclined outer sides of the met al ribsscarcely act at all in this matter, and hence do not chip off the stonewhich lies in contact with them. Thus the ribs of metal,

constructed and arranged as described, perprovided with two series ofribs, aa, constructfectly accomplish both objects desired, secnred inthe form and arranged in the manner deing the bearing firmly in the eyewithout either scribed, for the purposes set forth.

chipping or cracking the stone in use. WM. '1. "OSE.

What I claim as new, and desire to secule Witnesses: by Letters Patent,is F. P. HALE,

The soft-metal bearing B for emery wheels, F. C. HALE.

